[feature request] Show at mouse cursor -> show at text cursor

[feature request]
Currently the qmoji window opens either under the MacOS menu bar by default.
There is a "show at cursor" option that opens the window next to the mouse cursor, but it would be great to have an **option to open the window below the text cursor** (cf native OS emoji window)

Thanks!

The issue names no files, tests, or entry points. Start by locating the existing “show at cursor” option and the window-placement entry point, then investigate how the macOS text cursor position can be obtained. Done means an option opens the qmoji window below the text cursor, alongside the existing placement choices.

Written by the indexing model from the issue text.